Clean up unused AX APIs.

public/web/WebAXObject.h

Index: public/web/WebAXObject.h
diff --git a/public/web/WebAXObject.h b/public/web/WebAXObject.h
index 0d9c5bb33964efa1cc601793d08412bbf8d77e23..a1c551ef3e4b74009431ff5e84fbeefb797d562a 100644
--- a/public/web/WebAXObject.h
+++ b/public/web/WebAXObject.h
@@ -102,7 +102,6 @@ public:
     BLINK_EXPORT WebAXObject parentObject() const;
 
     BLINK_EXPORT bool isAnchor() const;
-    BLINK_EXPORT WebAXOptionalBool isAriaGrabbed() const;
     BLINK_EXPORT bool isAriaReadOnly() const;
     BLINK_EXPORT bool isButtonStateMixed() const;
     BLINK_EXPORT bool isChecked() const;
@@ -136,7 +135,6 @@ public:
     BLINK_EXPORT WebAXObject ariaActiveDescendant() const;
     BLINK_EXPORT WebString ariaAutoComplete() const;
     BLINK_EXPORT bool ariaControls(WebVector<WebAXObject>& controlsElements) const;
-    BLINK_EXPORT WebString ariaDropEffect() const;
     BLINK_EXPORT bool ariaFlowTo(WebVector<WebAXObject>& flowToElements) const;
     BLINK_EXPORT bool ariaHasPopup() const;
     BLINK_EXPORT bool isMultiline() const;
@@ -228,7 +226,6 @@ public:
     BLINK_EXPORT WebString computedStyleDisplay() const;
     BLINK_EXPORT bool accessibilityIsIgnored() const;
     BLINK_EXPORT bool lineBreaks(WebVector<int>&) const;
-    BLINK_EXPORT WebString textInputType() const;
 
     // Actions
     BLINK_EXPORT WebString actionVerb() const; // The verb corresponding to performDefaultAction.